Having just successfully connected a Mac Plus running System 3.2 to a Power Mac 8500 running System 9, I have to say that LocalTalk is the best thing ever. How many other computers from 1986 had built-in networking hardware and built-in OS support for file sharing? It may not be fast, but it works, and it's on every classic Mac.

What I don't love quite so much is the Chooser. After Apple put so much thought into the user experience in the rest of the Mac OS, I don't see how they came up with the totally unintuitive Chooser. What does it choose, exactly? Somehow it combines browsing the network with selecting printer drivers. Oh well... even if it makes no sense, it still works.